Abstract The Discrete Element Method (DEM) is used to simulate the mixing and discharging processes of binary particles in a laboratory truck mixer. The contact parameters in the DEM model are calibrated by experiments and then used to simulate the particle mixing and discharging processes in truck mixer under seven groups of operation parameters. Numerical results show good agreements with the experimental data in terms of the big particle content (BPC) of discharged samples and the discharging time (Td). It is found that the discharging speed of 8 rev/min produces the largest discharging rate (Dr) whereas the discharging homogeneity is the lowest. The highest discharging homogeneity is observed when the discharging speed is 5 rev/min. The effects of filling rate and mixing speed on the discharging rate are insignificant. The mixing homogeneity decreases with the increase of mixing time, mixing speed and filling rate, which result in the discharging homogeneity also decreasing with the increase of mixing speed and filling rate.

中文翻译：

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卡车搅拌机中干颗粒的混合与卸料研究

摘要 采用离散元法（DEM）模拟实验室卡车搅拌机中二元颗粒的混合和卸料过程。DEM模型中的接触参数通过实验标定，然后用于模拟七组操作参数下汽车搅拌机的颗粒混合和卸料过程。数值结果表明，放电样品的大颗粒含量（BPC）和放电时间（Td）与实验数据吻合良好。发现8 rev/min的放电速度产生最大的放电速率(Dr)，而放电均匀性最低。当放电速度为 5 转/分钟时，观察到最高的放电均匀性。填充速度和混合速度对出料速度的影响不显着。